Sedan Crater

A 104 kiloton thermonuclear explosion on July 6, 1962 created the Sedan Crater in Area 10 of Yucca Flat at the Nevada Test Site. At 1,214 feet in diameter and 330 feet deep, Sedan is the largest nuclear-caused crater in the United States. The detonation was part of the Operation Plowshare program intended to find peaceful uses for nuclear detonations, such as excavations for harbors, canals, and open pit mines. The explosion created fallout that affected more US residents than any other nuclear test, exposing more than 13 million people to radiation. That was the end of Operation Plowshare.